Siemens Building Technologies QPA Series Data Sheet

Room CO2/VOC/Temperature/RH

QPA Series

Description

The QPA Series Room Carbon Dioxide Sensors monitor
and transmit changes in CO2 to the building control
systems. No calibration of the CO2 sensor is necessary
— these microprocessor-based units consist of a non­dispersive infrared CO2 sensor that experiences less

than 1% drift per year for the rst two years of operation

and negligible drift thereafter. All variants for CO2 and
combination versions with Temperature or VOC deliver

0 to 10 Volt or 0 to 5 Volt (eld selectable) proportional

signals to the controller.

Features

• LCD display option

• Various models:
CO2
CO2/VOC
CO2/Temp
CO2/Temp/RH

• Built-in test function for troubleshooting

• Jumper selectable °C/°F units for temp models
w/display

• No Logo versions available

• QPA2080 and QPA2080D include multiple resistance
temperature elements

Room Carbon Dioxide & Temperature Sensor.

QPA2060D Q Series

Applications

These units are especially suited for applications where
precise, stable CO2 sensing is required.

E-35

Sensors

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QPA Series Specifications

E-36

Sensors

General

Installation ................................... 18 AWG cable length shared in conduit

with other sensor wiring 750 ft. (229 m) max

Connections .................................................................... Screw terminals

Dimensions ................................................... 3.94" H x 3.54" W x 1.65" D

(100 mm x 90 mm x 42 mm)

Voltage Requirement ......................................................... 13.5 to 35 Vdc

Housing Protection Class ...........................................NEMA 1 (all types)

CO2 Element

Operating Range .................................................................. 0 - 2000 ppm

Accuracy at Room Temperature ≈ 73°F (20°C) .........................+2% mV

Operating Temperature .................................-23 to +113°F (-5 to +45°C)

Temperature Effect .....................................Less than 0.1% per degree C

Sensing Element.............................................NDIR CO2 sensing module

Output Signal ............................0 to 10 Vdc, 0-100% Linear, Proportional

Polarity Protection...............................................................................Yes

Permissible Air Velocity in the Room ......................................<26.2 ft./s

Temperature Element
(for Combination CO2/T unit only)

Operating Temperature ......................................23 to 113°F (-5 to 45°C)

Time Constant ...........................................................................<1 minute

Accuracy .......................................................................................... ±0.8K

Output Signal ............................................................................ 0-10 volts

Calibration ........................................................................ None Required

Humidity Element

Measuring Range................................................................ 0 to 100% RH

Accuracy ...................................................................................... ±5% RH

QPA Series Product Ordering

Application Description Part No.

CO2 0 to 5 V or 0 to 10 V QPA2000

CO2 and VOC 0 to 5 V or 0 to 10 V QPA2002

CO2 and VOC 0 to 5 V or 0 to 10 V, with Display QPA2002D

CO2 and Temp (Active) 0 to 5 V or 0 to 10 V QPA2060

CO2 and Temp (Active) 0 to 5 V or 0 to 10 V, with Display QPA2060D

CO2, Temp and RH (Active) 0 to 5 V or 0 to 10 V QPA2062

CO2, Temp and RH (Active) 0 to 5 V or 0 to 10 V, with Display QPA2062D

CO2 and Temp (Passive)* 0 to 5 V or 0 to 10 V T (Selectable R) QPA2080

CO2 and Temp (Passive)* 0 to 5 V or 0 to 10 V, T (Selectable R) with Display QPA2080D

*Units include interchangeable resistance elements for LG-Ni1000, Pt1000, Pt100, and NTC 10K Ohm.

Accessories & Service Kits

E-51

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